Mine isn't I'm about 300m away and high enough that half of Hereford would be underwater before me, surface runoff is a worry though as the drains in the road are poorly maintained and I've got a cellar, thinking of installing a sump and pump.
My friend's house is a different matter, he's next to the river and his two acres turn into a tennis court size regularly through the winter months. His dad and uncle built a defensive wall around the house forty years ago which would have been topped by the river in 2020, two blokes and a load of sandbags saved the house one night.
Opposite his house (other side of the river) is a floodplain and slightly downstream is an elevated road crossing it which is effectively a dam, each year the road floods and is repaired which makes it higher - there are no culverts under the road.
I spent last autumn making a removable flood barrier for the top of the wall, I spent all of December installing it. It is yet to be tested.
The other problem he's got is runoff from a road, his house is dug into a bank with a main road immediately outside. He suspects the drain is broken and causing his wall to move, he's in discussion with the council and as yet nobody's come to investigate.
The same issues have been reported throughout the thread, lack of planning regarding managing water on floodplains and poor maintenance of drains.
